Flexible tubing.



A. SUNDH.

FLEXIBLE IUBING.

APPLICATION HLED ocnza, 19x3 Patented Apr. 1Q, 1936 WITNESSES.-

[MM X W UNITED STATES FATE AUGUST SUNDH, 0F HASTINGS-UPON HUDSON, NEW YQRK.

FLEXIBLE TUBING.

Application filed 0ctoher'23, i913.

To all whom it may concern:

Be it known that I, Anonsr SUNDH, a citizen of the United States, residing in Hastings-upon-Hudson, in the county of Westchester and State of New York, have invented a new and useful Improvement in Flexible Tubing, of which the following is a specification.

My invention relates to flexible metallic tubing employed for the transmission or conduction of fluids or other substances, such as water, steam, gas, air, or other substances.

It may also be used to inclose electric wires or ropes or cables or other like bodies which need to be supported or protected.

Further my invention is usable for any other purposes to which it may be adapted.

I will proceed to disclose and claim my invention in which Figure 1 represents a portion of the tub ing with an outside or encircling binding strip thereon; Fig. 2 is a cross sectional view of the tubing, showing one form thereof; Fig. 3 is a cross sectional view of a portion of the hose or piping, showing another modification thereof; Fig. t is a cross sectional view similar to those of Figs. 2 and 3, except that the packing is omitted therefrom.

In the transmission of fluids in tubes, or the carryingand supporting of other bodies therein, such for example, as those mentioned above, by way of illustration and not exclusive, it is desirable that the tubing shall be capable of being flexed or bent to adapt the same to fit the location or situa tion in which the tubing is to be placed; it is also desirable in a flexible tube that when the same is bent it shall remain leak-proof in the case of the transmission of fluids and its interior surface shall be free of irregularities in order that the flow of the fluids shall be unobstructed; the feature of smoothsurface is also desirable and highly useful in the case of the support or carrying therein of electric wires and in the case of cables or ropes or other bodies; it is my objectto produce a tube which shall have the qualities of being readily, easily and successfully flexed or bent as well as to be successfully usable for straight line work, and which will confine fluid under pressure so as successfully to withstand the pressure inside and outside as well.

Specification of Letters Patent.

Patented Apr. 15;, 192%.

Serial Kc. 795,788.

My invention is embodied in the ing disclosed forms, among ot iers, in Y there are metal strips a Z) of suitab and of a cross section similar to double-ended hook, substantially, strips are made up into a series of a long pitch, with their hooks enga each other to form the body of the tube hooks of one strip a facing toward he in terior of the pipe, and the books of ad jacent strip 2) facing the exterior i... the tube. The fit of these hooks may be made sufliciently tight to secure leak-proof joints, as shown in Fig. at; or there may be placed between the hooks and the wall of tin str a packing, c, as shown in Fig. or pa ing 0 between the adjacent 6, shown in Fig. 3. in all tle ins joints of course will be securely packed to be leak-proof. 1 wind around the body of the tube a holding or binding strip d in coils of shorter pitch than the pitch of the strips a and b, the binding or tying rip 5 s ing to aid in maintaining the tube and also serving as a protection to the out-l side wear or injury of the tube.

I have found by experiment that by arranging inetal strips of the shape shown in the drawing in a long pitch, that when the tube is bent a sliding action will take place between the strips, in something the same way as the strips in wire rope, which sliding action will permit ti: tube to be bent without spreading'or separating the strips. Such a structure will of course permit of the transmission of fluids without leakage. This is the important featin-e of my inven tion. With the, flexible tubes as at pres nt constructed, it has been found necessary to either have an inner continuous tube of rub her, for instance, for the conveyanceof the fluid, the metal tube merely servin armor to protect the inner tube from injury, or to place packing between the strips of metal, but in the latter case. owing toth'e manner in which the strips are laid. and shaped there is a constant griruling ofthe packing between the strips. whicl': 'e y soon results in the wearing out of the p. ing, and of course leakage of the tub rig. With my arrangement, however. 1 have, by making my strips of a peculiar shape and laying them in. a very long pitch. obtained long lived.

. which the tube is It is understood that my flexible tube will be formedpf suitable metal having in mind the particular purpose for which the tube shall be used; for example-if used in the transmission of water, one kind of metal, for example, brass, copper, aluminum, etc., is better adapted for the purpose, having in mind the corroding eflects of the water on the metal; while in the transmission of steam or as or air, particularly where the same is ighly heated, another kind of metal, for example, steel, might be better ada ted for the purpose than some other kin of metal.

' I have not, mentioned fthe material of which the [packing is composed, since it is obvious tolthose skilledin' the art that the material of the. packing like the metal for the strips will be selected from those which are best adapted for the particular use to ut; in each case, however, it will be understood of course, that the material selected ,will be such as to per mit the tube to, subserve its purpose of flexibleness.

On the insidesurface of one of the strips, for instance the outside strip a, I have placed a ridge a central of the longitudinal length r of the strip, which serves to strengthen the strip and render it more stable without materially increasing the amount or weight of metal in the strip; furthermore in the tube structure the ridge falls opposite the joint between the adjacent inner strips and serves, together with the packing, to insure the complete leak-proofness of the hose, among other things.

While I have disclosed several embodiments of my invention, I desire not to be excluded from the use of any equivalent embodiments within the skill and knowledge of persons conversant,ivith the art.

What I claim is my invention, and desire to have protected by Letters Patent of the United States is 1. In a flexible metallic tube, onumber of coils of long pitch, each of said coils formed in an oblong double hook-shaped cross section and hooked together to form a fluid-tight tube structure at all times, each coil having'a longitudinally placed center ridge to stren then the same.

2. In aflexi )le metallic tube, a number'of coils of long pitch, the coils having a longitudinally placed center ridge, each of the coils formed in an oblong double hookshaped cross section and hooked together to form a fluid tight tube structure at all times, and a packing ,placed within one of the strips forming theacoils between the adjoining strips. p

3. In a flexible metallic tube, a number of [coils of lonpitch, each of the coils formed in an oblong double hook shaped cross section and hooked together to form a fluid tight tube structure at all times, the coils having a longitudinally placed ridge substantially opposite the joint between the adbetween the adjoining strips.

4. In a flexible metallic tube, a number of coils of long pitch, each of the coils formed in an oblong double hook shaped'cross section and hooked together to form a fluidtight tube structure at all times, the coils having a longitudinally placed center ridge substantially opposite the joint between the adjacent inner strips, and a packing placed within one of the strips forming the coils between the adjoining strips.

5. Flexible metallic tubing comprising a plurality of longitudinal double hook shaped strips coiled in along pitch and hooked together to form a fluid-tight tubing at all times.

6. The combination of a plurality of longitudinal double hook-shaped metallic strips coiled in a long pitch and hooked together to form a fluid,,tig h't flexible tubing at all times.

7. The combination of a plurality of longitudinal do'ublehook-shaped metallic strips coiled in a long pitch and hooked together to form a fluid tight tube structure having uniform sliding motion between all of the strips when the tube is bent (Jo-maintain the tubing fluid tight. I

8. The combination of a plurality of longitudinal double hook-shaped metallic strips coiled in a long pitch and hooked together to form a-fluid tight flexible tube structure, said strips being so constructed that the same'will not be opened or contracted when the tube is bent and maintaining the same fluid tight at all times.

9. The combination of a plurality of longitudinal double hook-shaped metallic strips coiled in a long pitch and hooked together to form a fluid tight flexible tube structure, the length of the pitch being proportional to the desired flexibility ofthe tube whereby the tube may be bent a desired degree without opening or contracting of the strips and maintaining the tube'fluid tight} 10. The combination of a plurality "oi longitudinal double hook-shaped metallit strips coiled in a long pitch and hooked together to form a fluid tight flexible tube structure, aplurality of packing strips coiled in a long pitch and placed between the hook-shaped 'strips, the pitch of the strips and the packing strips being such as to maintain the tubing fluid tight at all times.

11. The combination of a plurality of longitudinal double hook-shaped metallic strips coiled in a. long pitch and hooked tothe hoolvshaped strips, the pitch of the & name to this specification in the presemie 0? strips and the packing strip being such as two subscribing witnesses.

to maintain the tubing fluid tight at all -r q v 4 l 7 k, v i

times, and a spiral strip of shorter pitch {I K by; than the long pitch strips wound utside the Witnesses:

tubing to reinfoi'i-e the same. JAMES '(i. BETUELL,

In testimony whereof. I have signed my WALTER C. STRANG. 

